<論文>TRMM降雨レーダのデータ解析に必要なブライトバンドの後方散乱および減衰特性

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Backscatter and attenuation properties of bright-band are examined by two models. The first model assumes spherical bright-band particles. The composition of each particle is assumed to be a uniform mixture of water, ice, and air. The second model assumes concentric spherical particles. Each particle has a spherical snow core which is covered with water. The composition of snow core is assumed to be a uniform mixture of ice and air. Computations are made at 13.8 GHz. This frequency is to be used by a space-borne radar in the Tropical Rainfall Measuring Mission (TRMM). Though the two models give different results, the following general conclusion is obtained. At a rainfall rate being less than a few mm/h, the two-way attenuation of bright-band is less than 0.5 dB and the effect of bright-band attenuation may be safely neglected in the rain observation from space. When the rainfall rate increases, however, the effect of bright-band attenuation becomes larger and it has to be incorporated into a TRMM rainfall-rate retrieval algorithm.
北海道東海大学の論文
1994-03-25